Interesting......my DD pup is on Eukanuba Large Breed at the breeders suggestion. I am sure all dogs are different but I'll keep it in mind. DuckdonMy DD had nothing but Eukanuba performance from the time he showed up 8 years ago. But recently, he had been having ear problems. The vet said they there were due to food allergies.
When new pup showed up a few weeks back, it was used to Nature's variety Prairie food. So, we switched up. New pup got Prairie puppy food. Existing critter got the Prairie adult food.
Pup is doing very well. The DD's ear problems are now a thing of the past. No more Eukanuba for him!
There are a few good ones in my limited experience. My last pup had soft stools a lot despite very high quality foods. A good thing about Eukanuba is the ingredient DHA which studies have shown sharply increase brain function. The studies involved puppies teaching themselves to push a button with their nose to open a door to maze, then solving the maze to get food. The DHA pups were far and above more successful than the non-dha pups. All pups were from same litter.